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Topic: Kelmar exciter supplies and changeovers
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Paul G. Thompson
The Weenie Man
![](http://www.film-tech.com/cgi-bin/paulpics.cgi)
Posts: 4718
From: Mount Vernon WA USA
Registered: Nov 2000
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posted 05-15-2001 12:16 AM
Bernie, I presume that the exciter lamp will not come on in the soundhead.Take an exciter lamp and some alligator clips and see if the power supply will light the bulb while you have the exciter lamp sitting on the table. If it lights up properly, you have a problem in your wiring to the exciter lamp holders in the projector. If the exciter lamp will not light, the power supply probably is kapoot! Some exciter power supplies want to see an exciter lamp that is not grounded in the sound head. The "whining" is probably caused by the power supply outputs being shorted through the grounded side of the exciter lamp in the soundhead. Reverse the output polarity of the exciter power supply, and see if it does the same thing. What kind of soundhead are you using? And, what is the model number of the exciter power supply? Is any of the exciter power supply outputs referenced to ground, or are they floating? (kinda like a balanced output). I run my exciter power supplies at about 7 to 8 volts. When you get it running, be sure to run Dolby Tone and calibrate your optical pre-amp in the processor.
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